I recently bought a couple of Tubes as Nos from Ebay, the experience was very unpleasant, even with a seller of 100% positive feedback. Be aware, there are a lot of Russian tubes with stamps of famous brands, like Amperex, Siemens or Telefunken. The one at ebay that you mentioned seems to be one of those with perfect stamp. That's why I decided to buy my tubes from (upscale) one of these site mentioned above.
As for 6922, it depends to your preamp or amp as to what feed them with. On my preamp (Einstein The tube mkII) I use two Telefunken for CD input which is kind of very neutral with some brightness. Amperex is more tuby sound and less neutral and use them on phono-pre input. Amperex has also a lot of variety, with construction made in Holland (very rare), England, Italy, India and ... Each has its own sound tonality.
Reading about tubes could be very useful, if you are like me and new on tube world:
http://soundstage.com/tubeor/tube1.htm
cheers...
As for 6922, it depends to your preamp or amp as to what feed them with. On my preamp (Einstein The tube mkII) I use two Telefunken for CD input which is kind of very neutral with some brightness. Amperex is more tuby sound and less neutral and use them on phono-pre input. Amperex has also a lot of variety, with construction made in Holland (very rare), England, Italy, India and ... Each has its own sound tonality.
Reading about tubes could be very useful, if you are like me and new on tube world:
http://soundstage.com/tubeor/tube1.htm
cheers...